Date: Wed, 16 Jun 2004 11:44:36 -0700 (PDT) From: Doug Ambrisko <ambrisko@ambrisko.com> To: Alan Cox <alc@cs.rice.edu> Cc: cvs-src@FreeBSD.org Subject: Re: cvs commit: src/sys/vm vm_contig.c Message-ID: <200406161844.i5GIiaZp094136@ambrisko.com> In-Reply-To: <20040615032242.GD6753@cs.rice.edu>
next in thread | previous in thread | raw e-mail | index | archive | help
Alan Cox writes: | On Mon, Jun 14, 2004 at 10:45:36PM -0400, Brian Feldman wrote: | > On Tue, Jun 15, 2004 at 01:02:00AM +0000, Brian Feldman wrote: | > > green 2004-06-15 01:02:00 UTC | > > | > > FreeBSD src repository | > > | > > Modified files: | > > sys/vm vm_contig.c | > > Log: | > > Make contigmalloc() more reliable: | > | > By the way, I'd be interested in specific "contigmalloc() wishlist" | > items anyone may have at this point. I think it could stand for a | > rewrite so it could be a lot more reliable still. On my system, the | > contigmalloc() still doesn't succeed if I don't stop any compilations | > currently in progress, but "totally reliable" isn't something that | > contigmalloc() was written in mind with. | > | > Peter Wemm expressed concern that contigmalloc() should really be | > allocating things from the top of usable physical memory. In addition | > to just rewriting it so that the page-by-page allocation is done | > transactionally and getting rid of the ugliness of unneededly forcing | > out all active and inactive pages possible, are there other major items? | | Separate the physical memory allocation from the virtual address space | allocation. Specifically, there should be a function that I'll call | vm_page_alloc_contig() that returns a pointer to the first of n | consecutive vm_page's from the vm_page array. No kernel virtual | addresses would be allocated by this function. Yes that would be great for systems that don't have much virtual address space available. Doug A.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200406161844.i5GIiaZp094136>